projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2003-2014 Free Software Foundation, Inc. |
| 8a3e10e0 UD |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 8a3e10e0 UD |
17 | |
| 18 | #include <sysdep.h> | |
| 19 | #define _ERRNO_H 1 | |
| 20 | #include <bits/errno.h> | |
| 21 | #include <tcb-offsets.h> | |
| 22 | ||
| 23 | /* Clone the calling process, but without copying the whole address space. | |
| 24 | The calling process is suspended until the new process exits or is | |
| 25 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 26 | and the process ID of the new process to the old process. */ | |
| 27 | ||
| 28 | ENTRY (__vfork) | |
| 29 | /* Save the PID value. */ | |
| 30 | stc gbr, r2 | |
| 31 | mov.w .L2, r0 | |
| 32 | mov.l @(r0,r2), r4 | |
| 33 | neg r4, r1 | |
| 34 | mov.l r1, @(r0,r2) | |
| 35 | ||
| 36 | mov.w .L1, r3 | |
| 37 | trapa #0x10 | |
| 38 | mov r0, r1 | |
| 39 | ||
| 40 | /* Restore the old PID value in the parent. */ | |
| 41 | tst r0, r0 | |
| 42 | bt/s 2f | |
| 43 | stc gbr, r2 | |
| 44 | mov.w .L2, r0 | |
| 45 | mov.l r4, @(r0,r2) | |
| 46 | mov r1, r0 | |
| 47 | 2: | |
| 48 | mov #-12, r2 | |
| 49 | shad r2, r1 | |
| 50 | not r1, r1 // r1=0 means r0 = -1 to -4095 | |
| 51 | tst r1, r1 // i.e. error in linux | |
| 52 | bf .Lpseudo_end | |
| 53 | SYSCALL_ERROR_HANDLER | |
| 54 | .Lpseudo_end: | |
| 55 | rts | |
| 56 | nop | |
| 57 | .L1: | |
| 58 | .word __NR_vfork | |
| 59 | .L2: | |
| 60 | .word PID - TLS_PRE_TCB_SIZE | |
| 61 | ||
| 62 | PSEUDO_END (__vfork) | |
| 63 | libc_hidden_def (__vfork) | |
| 64 | ||
| 65 | weak_alias (__vfork, vfork) |